TMJC 2025 H2 Physics P3 QP

CANDIDATE NAME ( ) CIVICS GROUP _________________________________________________________________________ H2 PHYSICS 9749/03 Paper 3 Longer Structured Questions 24 September 2025 2 hours Candidates answer on the Question Paper. No Additional Materials are required. _________________________________________________________________________ READ THESE INSTRUCTIONS FIRST Write your name and Civics Group in the spaces at the top of the page. Write in dark blue or black pen on both sides of the paper. You may use an HB pencil for any diagrams or graphs. Do not use staples, paper clips, glue or correction fluid. The use of an approved scientific calculator is expected, where appropriate. Section A Answer all questions. Section B Answer one question only. The number of marks is given in brackets [ ] at the end of each question or part question. ______________________________________________________________________________ This document consists of 30 printed pages and 2 blank pages. TAMPINES MERIDIAN JUNIOR COLLEGE JC2 PRELIMINARY EXAMINATION For Examiner’s Use Percentage Subtotal P1 / 30 / 15 Subtotal P2 / 80 / 30 Paper 3 1 / 8 2 / 6 3 / 9 4 / 7 5 / 9 6 / 10 7 / 11 8 / 20 9 / 20 Deduction Subtotal P3 / 80 / 35 Subtotal P4 / 55 / 20 Grand total / 100

2 Tampines Meridian Junior College 2025 JC2 Preliminary Examination H2 Physics Data speed of light in free space c = permeability of free space o = permittivity of free space ε0 = = elementary charge e = the Planck constant h = unified atomic mass constant u = rest mass of electron me = rest mass of proton mp = molar gas constant R = 8.31 J K−1 mol−1 the Avogadro constant NA = the Boltzmann constant k = gravitational constant G = acceleration of free fall g = 813.00 10 m s − 714 10 H m −− 12 18.85 10 F m−− ( )( ) 911/ 36 10 F m −− 191.60 10 C− 346.63 10 J s− 271.66 10 kg− 319.11 10 kg− 271.67 10 kg− 23 16.02 10 mol − 23 11.38 10 J K−− 11 2 26.67 10 N m kg−− 29.81 m s−

3 Tampines Meridian Junior College 2025 JC2 Preliminary Examination H2 Physics Formulae uniformly accelerated motion s = ut + at2 v2 = u2 + 2as work done on / by a gas W = pV hydrostatic pressure p = gh gravitational potential  = temperature T /K = T /°C + 273.15 pressure of an ideal gas p = mean translational kinetic energy of an ideal gas molecule E = kT displacement of particle in s.h.m. x = xo sin t velocity of particle in s.h.m. v = vo cos t =   electric current I = Anvq resistors in series R = … resistors in parallel = … electric potential V = alternating current / voltage X = xo sin t magnetic flux density due to a long straight wire B = magnetic flux density due to a flat circular coil B = magnetic flux density due to a long solenoid B = radioactive decay x = decay constant = 1 2 GM r− 21 3 Nm c V 3 2 22 oxx − 12RR++ 1 / R 121/ 1/RR++ 04 Q r 0 2 d   I 0 2 N r  I 0n I ( )0 expxt −  1 2 ln2 t

4 Tampines Meridian Junior College 2025 JC2 Preliminary Examination H2 Physics Section A Answer all questions in this section in the spaces provided. 1 Object A of mass m is projected with a velocity of 2.4 m s−1 on a frictionless surface, directly towards a stationary object B of mass 4m, as shown in Fig. 1.1. A spring of negligible mass is fixed on object B such that the collision with object A is elastic and head-on. Fig. 1.1 (a) Explain what is meant by an elastic collision. …………………………………………………………….………………………………....... …………………………………………………………….……………………………. [1] (b) Calculate the speed of object A after collision. speed of object A = …………………….. m s−1 [3] 2.4 m s–1 frictionless surface spring object A object B m 4m

5 Tampines Meridian Junior College 2025 JC2 Preliminary Examination H2 Physics (c) At one instant during the collision, the two particles have a common speed vo. Show that vo is 0.48 m s−1. [1] (d) On the axes in Fig. 1.2, sketch two graphs to show the variation with time t of the velocities v of object A and object B. Label the graphs A and B respectively. Numerical labels are not required. Fig. 1.2 [3] before collision during collision after collision t / s v / m s−1 0

6 Tampines Meridian Junior College 2025 JC2 Preliminary Examination H2 Physics 2 A child slides down a slope PQ of height 7.0 m, as shown in Fig. 2.1. Fig. 2.1 (not drawn to scale) She started from rest at P and reaches a speed of 4.8 m s−1 at Q. A resistive force opposes the motion of the child as she slides down. (a) Determine the ratio kinetic energy of the child at Q with resistive force kinetic energy of the child at Q if there is no resistive force . ratio = …………………………. [2] child surface of slide P Q 7.0 m

7 Tampines Meridian Junior College 2025 JC2 Preliminary Examination H2 Physics (b) At Q, the child, of mass 20 kg, makes contact with a soft board attached to a spring. The spring compresses and the child is eventually brought to rest, as shown in Fig. 2.2. Fig. 2.2 The spring has a spring constant of 54 N m −1. The maximum compression of t he spring is 2.1 m. Calculate the efficiency of the transfer of the kinetic energy of the child at Q to the elastic potential energy of the spring. efficiency = …………………………. % [2] (c) Suggest two reasons why the efficiency in (b) is not 100%. 1 …………………………………………………………….………………………………... …………………………………………………………….…………………………………... 2 ………………………………………………………….…………………………………... …………………………………………………………….……………………………. [2] surface of slide spring child soft board

8 Tampines Meridian Junior College 2025 JC2 Preliminary Examination H2 Physics 3 (a) Define gravitational field strength. ……….………………………………………………………………………........................ …………………………………………………………………………….................... [1] (b) Explain why for a satellite in orbit around a planet, the gravitational field strength g at the position of the satellite must have the same magnitude and direction as the centripetal acceleration a of the satellite. ……….………………………………………………………………………........................ ……….………………………………………………………………………........................ ……….………………………………………………………………………........................ …………………………………………………………………………….................... [2]

9 Tampines Meridian Junior College 2025 JC2 Preliminary Examination H2 Physics (c) At a distance r away from the centre of a planet X, the gravitational field strength due to the planet is given by g. It is given that g obeys the inverse square law, where 2 1g r  . Fig. 3.1 shows the variation with lg r of lg g. Fig. 3.1 -0.4 -0.2 0.0 0.2 0.4 0.6 0.8 1.0 1.2 1.4 7.9 8.0 8.1 8.2 8.3 8.4 8.5 8.6 8.7 lg (r / m) lg (g / N kg-1)

10 Tampines Meridian Junior College 2025 JC2 Preliminary Examination H2 Physics (i) Use data from Fig. 3.1 to show that the gravitational field strength of the planet obeys the inverse square law. [2] (ii) A satellite is in an orbit of radius 4.18  108 m around the planet. Using Fig. 3.1, determine the speed of the satellite. speed = …………..……… m s-1 [3] (iii) Another planet Y has a smaller mass than planet X. On Fig. 3.1, sketch the graph for planet Y. [1]